题目内容：

帮我解释以下英语名词意思
Dpu-----defect per unit
Dpo-----defect per opportunity
DPPM-----defect part per million
DPMO------defect per million opportunity

优质解答

DPMO 百万个机会的缺点数 Defects per million opportunities
DPM 每百万单位的缺点数 Defects per million
DPU 单位缺点数 Defects per unit
DPPM 百万分之…的不良率 Defect Part Per Million